Eccentric-cam brake.



EGGENTBIO 0AM BRAKE. APPLIUATION FILED JAN. 30, 1911.-

m 7 55 w 9 H cJ 1 e nen n. L v mwi W M aymfw M N Jf d 2 e m m sans ALBERT LATHROP, JOHN M. SGHWEIZER, AND WILLIAM T. JOHNSTON, OF COLTON, CALIFORNIA.

ECCENTRIC-CAM BRAKE.

Specification of Letters Patent.

Patented Apr. 11, 1911.

Application filed. January 30, 1911. Serial No. 605,569.

To all whom it may concern:

Be it known that we, ALBERT LATHROP, JOHN M. SoHWnIzER, and "WILLIAM T. JoHNs'roN, citizens of the United States, residing at Colton, California, have invented a new and useful EcccntricCam Brake, of which the following is'a specification.

Our object is to produce a car brake which may be operated either with the air brake system or by hand and to provide the hand operated mechanism with means for giving the brakes an extra pull in emergencies; and our invention consists of the novel features herein shown and described and claimed.

In the drawings: Figure 1 is a plan of mechanism connected with the lower end of the brake staff, the staff being shown in section as indicated by the line 11 in Figs. 3 and a and the parts being shown in full lines with the brake released and in dotted lines with the brake as ordinarily set by hand. Fig. 2 is a view analogous to Fig. 1 and showing the brake set still tighter than Fig. 1 in full lines and showing the brake set up to the limit in dotted lines. Fig. 3 is a side elevation of the parts shown in Fig. 1 as seen looking in the direction of the arrow 3. Fig. 4: is a cross sectional detail on the lines H of Figs. 1 and 3. Fig. 5 is a view analogous to- Figs. 1 and 2 and showing the brakes set up nearly to the limit and held by the pawl and ratchet.

Referring to the drawings in detail: The lever 1 is connected to the air-brake mechanism by the rod 2, the hand brake connect-- ing rod 3 extends from the swinging end of the lever 1. The cam head hub 1 is fixed upon the lower end of the brake staff 5, the lower end of the brake staif being flush with the lower face of the cam head hub, as shown in Figs. 3 and 4. The crank arm 6 extends from the hub 4; and the slotted connecting rod section 7 is connected to the outer end of the crank arm 6 by the pivot are not tight enough for an emergency, the

brake staff 5 is operated still farther, the lug 11 engaging against the section 7 and carryng it around, as shown in Fig. 2 and durlng this operation if it is desired to hold the brake the pawl 12 engages the ratchet wheel 13 fixed upon the brake staif 5 and continued operation of the brake staif will carry the parts to the position shown in Fig. 2, thereby setting the brakes as tight as possible and the pawl and ratchet 12 and 13, will hold.

We call special attention to the slotted connecting rod section 7 which allows the air-brake system to work without in any way moving the hand brake system and to the emergency crank arm 10 and lug 11 engaging the slotted connecting rod 7 and the pawl and ratchet 12 and 13 holding the brake staff against the force exerted upon the lug 11.

We claim:

1. An eccentric cam brake comprising the combination with the brake Sta-if, of a crank arm fixed upon the lower end of the brake staff, a slotted connecting rod section pivot ally and slidingly connected to the crank arm, a second crank arm extending in the opposite direction from the first crank arm, and a stop lug extending downwardly from the outer end of the second crank arm in position to engage the slotted connecting rod section.

2. An eccentric cam brake comprising the combination with a brake staff, of a crank arm extending from the lower end of the 1 brake staff, a slotted connecting rod section pivotally connected to the crank arm, a sec ond crank arm extending in the opposite direction from the first crank arm, and a stop lug extending downwardly from the outer end of the second crank arm in position to engage the slotted connecting rod section,the stop lug being located at one side of a diametrical line extending from the pivot of the first crank arm.

3. An eccentric cam brake comprising the combination with a brake staff, of a crank arm extending from the lower end of the brake staff, a slotted connecting rod section pivotally connected to the crank arm, a sec- 0nd crank arm extending in the opposite direction from the first crank arm, a stop lug extending downwardly from the outer end of the second crank arm in position to engage the slotted connecting rod section, the

stop lug being located at one side of a diametrical line extending fromthe pivotof the first crank arm, and a pawl and ratchet for holding the brake staff.

ALBERT LATHROP. JOHN M. SCHWEIZER. \VILLIAM T. JOHNSTON. Vitnesses J. R. BURNS, DAVID O. LEWIS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents Washington, D. C. 

